含石墨烯润滑油润滑机制的分子动力学模拟  

Molecular Dynamics Simulation of Lubricating Mechanism of Graphene-containing Lubricating Oil

作　　者：张丽秀[1] 芦冰 吴玉厚 张珂 颜婷婷[4] ZHANG Lixiu;LU Bing;WU Yuhou;ZHANG Ke;YAN Tingting(Research Center for Analysis and Detection Technology,Shenyang Jianzhu University,Shenyang Liaoning 110168,China;School of Mechanical Engineering,Shenyang Jianzhu University,Shenyang Liaoning 110168,China;National and Local Joint Engineering Laboratory of High-grade Stone NC Processing Equipment and Technology,Shenyang Liaoning 110168,China;School of Science,Shenyang Jianzhu University,Shenyang Liaoning 110168,China)

机构地区：[1]沈阳建筑大学分析与检测技术研究中心,辽宁沈阳110168 [2]沈阳建筑大学机械工程学院,辽宁沈阳110168 [3]“高档石材数控加工装备与技术”国家地方联合工程实验室,辽宁沈阳110168 [4]沈阳建筑大学理学院,辽宁沈阳110168

出　　处：《润滑与密封》2019年第10期83-91,108,共10页Lubrication Engineering

基　　金：国家自然科学基金项目(51375317;51675353;11604224);辽宁省教育厅项目(LJZ2017005);沈阳市科技计划项目(F16-105-4-00)

摘　　要：采用分子动力学方法研究石墨烯作为正十六烷烃(C16H34)润滑油的添加剂对氮化硅-轴承钢(Si3N4-GCr15)摩擦副润滑性能的影响,分析石墨烯质量分数、压力及剪切速度对薄膜润滑区域范德华能、剪切应力及类固膜厚度的影响规律。研究表明:适量的石墨烯可以提高润滑区域的范德华能,增加类固膜厚度,降低Si3N4-GCr15摩擦副的剪切应力,减少摩擦副间摩擦力;石墨烯摩尔质量分数为2.5%时,润滑区域范德华能最大,剪切应力最小;添加石墨烯后,范德华能、剪切应力及类固膜厚度随着压力和剪切速度的变化而较为平稳,而没有添加石墨烯时三者出现较大的波动。可见,石墨烯作为添加剂,改变了压力、剪切速度影响下润滑区域范德华能、剪切应力、类固膜厚度的变化规律。The effects of graphene as an additive of n-hexadecane(C 16 H 34 )lubricating oil on the lubricating properties of silicon nitride-bearing steel(Si 3N 4-GCr15)friction pair were studied by molecular dynamics method.The effects of graphene mass fraction,pressure and shear rate on the van der Waals energy,shear stress and solid film thickness of the film lubrication zone were analyzed.The results show that an appropriate amount of graphene can improve the van der Waals energy of the lubrication region,increase the thickness of the solid film,reduce the shear stress of the friction pair of Si 3N 4-GCr15,and reduce the friction between the friction pairs.When the graphene molar mass fraction is 2.5%,the van der Waals energy in the lubrication region is the largest and the shear stress is the smallest.When graphene is added,van der Waals energy,shear stress and solid film thickness change smoothly with changes in pressure and shear velocity,but they have a large fluctuations when graphene is not added.It can be concluded that graphene as an additive changes the variation of van der Waals,shear stress and solid film thickness in the lubrication zone under influence of pressure and shear velocity.

关 键 词：双层石墨烯 正十六烷烃 摩擦副 薄膜润滑 分子动力学 

分 类 号：TH117.2[机械工程—机械设计及理论]